2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 10:15 AM - 10:30 AM | VULNERABILITY OF FOUR ENDEMIC FISHES TO CLIMATE WARMING IN A TEMPERATE BIODIVERSITY HOTSPOT | 410 A
VULNERABILITY OF FOUR ENDEMIC FISHES TO CLIMATE WARMING IN A TEMPERATE BIODIVERSITY HOTSPOT
Faunal vulnerability to climate warming depends on species-specific sensitivities and spatially-varying exposure to warming. Southern Appalachia is a hotspot for fish diversity, but little is known about interspecific variation in thermal biology or exposure to temperature extremes. We assessed thermal habitat and physiological tolerance, and forecasted distributional changes and warming tolerance of four endemic fishes (Notropis leuciodus, N. rubricroceus, Etheostoma rufilineatum, and E. chlorobranchium) that differ in elevational limits and represent the two most species-rich clades in the region. We used environmental niche modeling (ENM) to map species distributions, and combined thermal tolerance experiments with weather simulations to assess heat stress under contemporary and future climates. ENMs projected declines in suitable habitat and upslope shifts for all species except the low-elevation darter, E. rufilineatum, which is projected to expand its range into high-elevation streams. Extreme heat events never exceeded thermal tolerances under contemporary climate, but did at low elevations under future climates. Results suggest that thermal optima drive contemporary elevational limits of the four species, whereas both optima and maxima will likely drive future elevational shifts. Integrating physiological and distributional information provided complementary insight into contemporary and future species distributions.
- Modeling
- Distribution
- Fish
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Presenters/Authors
Matthew Troia
(), University of Texas San Antonio, troiamj@gmail.com;
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Xingli Giam
(), University of Tennessee, xgiam@utk.edu;
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